利用Java生成靜態(tài)HMTL頁(yè)面的方法收集

生成靜態(tài)頁(yè)面技術(shù)解決方案之一

轉(zhuǎn)載者前言：這是一個(gè)全面的jsp動(dòng)態(tài)頁(yè)面靜態(tài)化方案，本站的帖子靜態(tài)化方案將借鑒這篇帖子中方法。向[url]http://www.agilejava.org[/url]的single的共享精神致敬。

轉(zhuǎn)帖正文：

?????? 相信很多人都希望自己的頁(yè)面越快越好，最好是能靜態(tài)的，提高客戶訪問(wèn)速度。也便于搜索引擎搜索。所以，就希望我們的動(dòng)態(tài)讀取數(shù)據(jù)庫(kù)的頁(yè)面，盡可能的生成靜態(tài)頁(yè)面。一下系列文章，介紹一下個(gè)人的解決方案。

????? 本系列將介紹個(gè)人的一種方法，在不改變?cè)瓉?lái)jsp文件的基礎(chǔ)上，只需要加入少量的代碼，就讓你的新聞發(fā)布系統(tǒng)，很容易就完全變成靜態(tài)的頁(yè)面。

??????????? 本文假設(shè)你是用java開(kāi)發(fā)的web動(dòng)態(tài)頁(yè)面。

?????????? 第一步，加入servlet.代碼如下。


????? public class ToHtml extends HttpServlet {

?????? public void service(HttpServletRequest request, HttpServletResponse response)
???????? throws ServletException, IOException {
??????? String url = "";
??????? String name = "";

??????? ServletContext sc = getServletContext();

??????? String file_name = request.getParameter("file_name");// 你要訪問(wèn)的jsp文件名,如index，不包括擴(kuò)展名

??????? // 則你訪問(wèn)這個(gè)servlet時(shí)加參數(shù).如[url]http://localhost/test/toHtml?file_name=index[/url]

??????? url = "/" + file_name + ".jsf";// 你要生成的頁(yè)面的文件名。我的擴(kuò)展名為jsf .

??????? name = ConfConstants.CONTEXT_PATH+"\\"+ file_name + ".htm";// 這是生成的html文件名,如index.htm.文件名字與源文件名相同。擴(kuò)展名為htm

????? //ConfConstants.CONTEXT_PATH為你的應(yīng)用的上下文路徑。

??????? RequestDispatcher rd = sc.getRequestDispatcher(url);

??????? final ByteArrayOutputStream ōs = new ByteArrayOutputStream();

??????? final ServletOutputStream stream = new ServletOutputStream() {
???????? public void write(byte[] data, int offset, int length) {
????????? os.write(data, offset, length);
???????? }

???????? public void write(int b) throws IOException {
????????? os.write(b);
???????? }
??????? };

??????? final PrintWriter pw = new PrintWriter(new OutputStreamWriter(os));

??????? HttpServletResponse rep = new HttpServletResponseWrapper(response) {
???????? public ServletOutputStream getOutputStream() {
????????? return stream;
???????? }

???????? public PrintWriter getWriter() {
????????? return pw;
???????? }
??????? };
??????? rd.include(request, rep);
??????? pw.flush();
??????? FileOutputStream fos = new FileOutputStream(name); // 把jsp輸出的內(nèi)容寫(xiě)到xxx.htm
??????? os.writeTo(fos);
??????? fos.close();
??????? PrintWriter ōut = response.getWriter();
??????? out
????????? .print("<p align=center><font size=3 color=red>頁(yè)面已經(jīng)成功生成！single<br>[url]http://www.agilejava.org/space/?[/url] 233</font></p>");
?????? }
????? }

????? 第二步、配置你的web.xml

?????? <servlet>
??????? <servlet-name>toHtml</servlet-name>
??????? <servlet-class>mj.util.html.ToHtml</servlet-class>//你的servlet的類。
?????? </servlet>
?????? <servlet-mapping>
??????? <servlet-name>toHtml</servlet-name>
??????? <url-pattern>/toHtml</url-pattern>
?????? </servlet-mapping>

????? 第三步、運(yùn)行servlet。如：[url]http://localhost:8080/test/toHtml?file_name=index[/url]

??????

????? OK,這就在你的test項(xiàng)目的根目錄下，生成了一個(gè)index.htm的靜態(tài)文件。　

??????

????? 局限性：本文只能生成一個(gè)文件！訪問(wèn)一次，生成一個(gè)文件。并且生成的文件名也與原來(lái)的文件名相同。

????? 比較適合主頁(yè)生成靜態(tài)頁(yè)面。

??????

????? 本系列的后續(xù)文章將解決更多的問(wèn)題。使之在新聞發(fā)布系統(tǒng)中，很容易就集成應(yīng)用。

----------------------------------------------------------------------------------------------------

生成靜態(tài)頁(yè)面技術(shù)解決方案之二



??????????? 注意：轉(zhuǎn)貼本文，請(qǐng)加上本文鏈接[url]http://www.agilejava.org/space/?233/action_viewspace_itemid_21.html?[/url]

?????????? 在上一篇文章中，生成靜態(tài)頁(yè)面，是有一定的局限性的。生成主頁(yè)是很方便，但要生成二級(jí)頁(yè)面，就不方便了。

???????????? 本文假設(shè)一個(gè)新聞發(fā)布系統(tǒng)。希望后臺(tái)發(fā)布的，前臺(tái)顯示的是靜態(tài)的文檔。這就涉及，主頁(yè)要是靜態(tài)的，同時(shí)二級(jí)列表也是靜態(tài)的，新聞內(nèi)容也是靜態(tài)的。也就是 說(shuō)， 在發(fā)布一篇新聞的時(shí)候，可能涉及到三個(gè)地方生成靜態(tài)文檔。并且，要生成一個(gè)網(wǎng)頁(yè)，必須訪問(wèn)一個(gè)servlet。在大量生成靜態(tài)網(wǎng)頁(yè)的時(shí)候，

??????????? 以下方法，可以解決這些問(wèn)題。

????????? 一、加入一下servelet

????????? /**
?????????? * @file_name 文件名及文件之后的參數(shù).最好為a.jsf?fileId=aaaa
?????????? * @path 文件所在的路徑.相對(duì)于根目錄而言的.
?????????? * @realName文件要保存的名字
?????????? * @realPath文件要保存的真實(shí)路徑。默認(rèn)與文件所在的目錄相同。
?????????? */
????????? public class ToHtmlPath extends HttpServlet {

?????????? public void service(HttpServletRequest request, HttpServletResponse response)
???????????? throws ServletException, IOException {
??????????? String url = "";
??????????? String name = "";

??????????? ServletContext sc = getServletContext();

??????????? String file_name = request.getParameter("file_name");// 你要訪問(wèn)的jsp文件,如news.jsf。
??????????? // file_name如：fileDetail.jsf?fileId=56.要是有參數(shù)， 只有一個(gè)參數(shù)。并且以參數(shù)名作為文件名。
??????????? String realName = request.getParameter("realName");// 要保存的文件名。如aaa;注意可以沒(méi)有這個(gè)參數(shù)。

??????????? String path = request.getParameter("path");// 你要訪問(wèn)的jsp文件路徑。如news。注意可以沒(méi)有這個(gè)參數(shù)。

??????????? String realPath = request.getParameter("realPath");// 你要保存的文件路徑,如htmlNews.注意可以沒(méi)有這個(gè)參數(shù)。
??????????? // 下面確定要保存的文件名字。
??????????? if (realName == null || realName == "") {
???????????? int a = 0;
???????????? a = file_name.indexOf("=") + 1;
???????????? realName = file_name.substring(a);
???????????? if (realName.indexOf(".")>0) {
????????????? realName = file_name.substring(0, file_name.indexOf("."));
???????????? }
??????????? }
??????????? // 下面構(gòu)造要訪問(wèn)的頁(yè)面。
??????????? if (path == null || path == "") {
???????????? url = "/" + file_name;// 這是你要生成HTML的jsp文件,如
??????????? } else {
???????????? url = "/" + path + "/" + file_name;// 這是你要生成HTML的jsp文件,如
??????????? }
??????????? // 下面構(gòu)造要保存的文件名，及路徑。
??????????? // 1、如果有realPath，則保存在realPath下。
??????????? // 2、如果有path則保存在path下。
??????????? // 3、否則，保存在根目錄下。
??????????? if (realPath == null || realPath == "") {
???????????? if (path == null || path == "") {
????????????? name = ConfConstants.CONTEXT_PATH + "\\" + realName + ".htm";// 這是生成的html文件名,如index.htm.說(shuō)明： ConfConstants.CONTEXT_PATH為你的上下文路徑。
???????????? } else {
????????????? name = ConfConstants.CONTEXT_PATH + "\\" + path + "\\"
??????????????? + realName + ".htm";// 這是生成的html文件名,如index.htm.
???????????? }
??????????? } else {
???????????? name = ConfConstants.CONTEXT_PATH + "\\" + realPath + "\\"
?????????????? + realName + ".htm";// 這是生成的html文件名,如index.htm.
??????????? }

??????????? // 訪問(wèn)請(qǐng)求的頁(yè)面，并生成指定的文件。
??????????? RequestDispatcher rd = sc.getRequestDispatcher(url);

??????????? final ByteArrayOutputStream ōs = new ByteArrayOutputStream();

??????????? final ServletOutputStream stream = new ServletOutputStream() {
???????????? public void write(byte[] data, int offset, int length) {
????????????? os.write(data, offset, length);
???????????? }

???????????? public void write(int b) throws IOException {
????????????? os.write(b);
???????????? }
??????????? };

??????????? final PrintWriter pw = new PrintWriter(new OutputStreamWriter(os));

??????????? HttpServletResponse rep = new HttpServletResponseWrapper(response) {
???????????? public ServletOutputStream getOutputStream() {
????????????? return stream;
???????????? }

???????????? public PrintWriter getWriter() {
????????????? return pw;
???????????? }
??????????? };
??????????? rd.include(request, rep);
??????????? pw.flush();
??????????? FileOutputStream fos = new FileOutputStream(name); // 把jsp輸出的內(nèi)容寫(xiě)到xxx.htm
??????????? os.writeTo(fos);
??????????? fos.close();
??????????? PrintWriter ōut = response.getWriter();
??????????? out.print("<p align=center><font size=3 color=red>success！</font></p>");
?????????? }
????????? }

??????????

????????? 二、在web.xml里面配置你的servlet

?????????? <servlet>
??????????? <servlet-name>toHtmlPath</servlet-name>
??????????? <servlet-class>mj.util.html.ToHtmlPath</servlet-class>
?????????? </servlet>
?????????? <servlet-mapping>
??????????? <servlet-name>toHtmlPath</servlet-name>
??????????? <url-pattern>/toHtmlPath</url-pattern>
?????????? </servlet-mapping>

????????? 三、寫(xiě)一個(gè)通用的方法，　供調(diào)用。

????????? public class CallHtml {

?????????? public static void callOnePage(String fileName, String path,
???????????? String realName, String realPath) {
??????????? try {
???????????? String str = "http://localhost:8080/test/toHtmlPath?file_name="
?????????????? + fileName + "&&path=" + path + "&&realName=" + realName
?????????????? + "&&realPath=" + realPath;
???????????? int httpResult;
???????????? URL url = new URL(str);
???????????? URLConnection connection = url.openConnection();
???????????? connection.connect();
???????????? HttpURLConnection httpURLConnection = (HttpURLConnection) connection;
???????????? httpResult = httpURLConnection.getResponseCode();
???????????? if (httpResult != HttpURLConnection.HTTP_OK) {
????????????? System.out.println("沒(méi)有連接成功");
???????????? } else {
????????????? System.out.println("連接成功了　");
???????????? }
??????????? } catch (Exception e) {
???????????? // TODO: handle exception
??????????? }
?????????? }

????????? //這個(gè)方法適當(dāng)重載，就可以省去一些參數(shù)傳遞。

????????? }

????????? 四、在你的新聞發(fā)布save時(shí)，調(diào)用方法。

????????? 1、CallHtml.callOnePage("info.jsf?file_id=aaa",news,"", "");//將在news目錄下生成一個(gè)aaa.htm的靜態(tài)文件

????????? 2、CallHtml.callOnePage("newsList.jsf",news,"", "");//將在news目錄下生成一個(gè)newsList.htm的靜態(tài)文件,顯示最新的新聞。

????????? ３、CallHtml.callOnePage("index.jsf","","", "");//生成主頁(yè)。

????????? 好了，這就保持了，主頁(yè)、列表、新聞內(nèi)容都是最新的靜態(tài)頁(yè)面了。


----------------------------------------------------------------------------------------------------

一個(gè)實(shí)現(xiàn)將動(dòng)態(tài)頁(yè)面轉(zhuǎn)為靜態(tài)的方案

1.前言
為了能深入淺出的理解這個(gè)框架的由來(lái)，我們首先來(lái)了解一下JSP解析器將我們寫(xiě)的JSP代碼轉(zhuǎn)換成的JAVA文件的內(nèi)容。
下面是一個(gè)JSP文件test.jsp
經(jīng)過(guò)TOMCAT轉(zhuǎn)換出的JAVA文件test$jsp.java內(nèi)容如下：
package org.apache.jsp;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import org.apache.jasper.runtime.*;

public class test$jsp extends HttpJspBase {

??? static {
??? }
??? public testOutRedir$jsp( ) {
??? }

??? private static boolean _jspx_inited = false;

??? public final void _jspx_init() throws org.apache.jasper.runtime.JspException {
??? }

??? public void _jspService(HttpServletRequest request, HttpServletResponse? response)
??????? throws java.io.IOException, ServletException {

??????? JspFactory _jspxFactory = null;
??????? PageContext pageContext = null;
??????? HttpSession session = null;
??????? ServletContext application = null;
??????? ServletConfig config = null;
??????? JspWriter out = null;
??????? Object page = this;
??????? String? _value = null;
??????? try {

??????????? if (_jspx_inited == false) {
??????????????? synchronized (this) {
??????????????????? if (_jspx_inited == false) {
??????????????????????? _jspx_init();
??????????????????????? _jspx_inited = true;
??????????????????? }
??????????????? }
??????????? }
??????????? _jspxFactory = JspFactory.getDefaultFactory();
??????????? response.setContentType(text/html;charset=GB2312);
??????????? pageContext = _jspxFactory.getPageContext(this, request, response,
??????????????????????????? , true, 8192, true);

??????????? application = pageContext.getServletContext();
??????????? config = pageContext.getServletConfig();
??????????? session = pageContext.getSession();
??????????? out = pageContext.getOut();
??????????????? //為了節(jié)省篇幅，我刪除了解釋器添加的注釋
??????????????? out.write(\r\n);
//上一句是由于后面的換行產(chǎn)生的
??????????????? out.write();
??????????????? out.write(\r\n\r\n\r\n\r\n);
??????????????? out.print( 輸出 );
??????????????? out.write(\r\n\r\n\r\n\r\n);
??????? } catch (Throwable t) {
??????????? if (out != null && out.getBufferSize() != 0)
??????????????? out.clearBuffer();
??????????? if (pageContext != null) pageContext.handlePageException(t);
??????? } finally {
??????????? if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext);
??????? }
??? }
}
從上面的代碼中可以清晰的看到JSP內(nèi)建的幾個(gè)對(duì)象（out、request、response、session、pageContext、application、config、page）是怎么產(chǎn)生的，懂servlet的朋友一看就能明白。
下面重點(diǎn)理解一下out對(duì)象，它被聲明為JspWriter類型，JspWriter是一個(gè)抽象類，在包javax.servlet.jsp中可以找到它的定義。
abstract public class javax.servlet.jsp.JspWriter extends java.io.Writer{
?????? final public static int NO_BUFFER = 0;
?????? final public static int DEFAULT_BUFFER = -1;
?????? final public static int UNBOUNDED_BUFFER = -2;
?????? protected int bufferSize;
?????? protected Boolean autoFlush;
?????? protected javax.servlet.jsp.JspWriter(int arg1, boolean arg2);
??????
??? abstract public void newLine() throws IOException ;
??? abstract public void print(boolean arg0) throws IOException ;
??? abstract public void print(char arg0) throws IOException ;
??? abstract public void print(int arg0) throws IOException ;
??? abstract public void print(long arg0) throws IOException ;
??? abstract public void print(float arg0) throws IOException ;
??? abstract public void print(double arg0) throws IOException ;
??? abstract public void print(char[] arg0) throws IOException ;
??? abstract public void print(String arg0) throws IOException ;
??? abstract public void print(Object arg0) throws IOException ;
??? abstract public void println() throws IOException ;
??? abstract public void println(boolean arg0) throws IOException ;
??? abstract public void println(char arg0) throws IOException ;
??? abstract public void println(int arg0) throws IOException ;
??? abstract public void println(long arg0) throws IOException ;
??? abstract public void println(float arg0) throws IOException ;
??? abstract public void println(double arg0) throws IOException ;
??? abstract public void println(char[] arg0) throws IOException ;
??? abstract public void println(String arg0) throws IOException ;
??? abtract public void println(Object arg0) throws IOException ;
??? abstract public void clear() throws IOException ;
??? abstract public void clearBuffer() throws IOException ;
??? abstract public void flush() throws IOException ;
??? abstract public void close() throws IOException ;
??? public int getBufferSize() ;
??? abstract public int getRemaining() ;
??? public boolean isAutoFlush() ;
}
我相信當(dāng)我寫(xiě)到這里你可能已經(jīng)知道我想怎么做了。是的，來(lái)個(gè)偷天換日，繼承JspWriter類，然后實(shí)現(xiàn)其定義的虛函數(shù)，然后把out變量替換成你自己實(shí)現(xiàn)的類的實(shí)例就ok了。
2.實(shí)現(xiàn)替換
假設(shè)
3.更新問(wèn)題
下面就討論一下如何更新生成靜態(tài)文件，其實(shí)從上面實(shí)現(xiàn)中你可以看到，很簡(jiǎn)單的就是將生成的靜態(tài)文件刪除即可，至于什么時(shí)候刪除，要看你的需求了。我能想到的幾種情況如下
當(dāng)用來(lái)生成頁(yè)面的數(shù)據(jù)更新時(shí)
如果不需要很提供時(shí)時(shí)的數(shù)據(jù)可以定時(shí)更新
永遠(yuǎn)不更新
----------------------------------------------------------------------------------------------------

JSP生成靜態(tài)HTML頁(yè)面范例

先建立一個(gè)模本頁(yè)面:template.htm

<Html>
<head>
<title>###title###</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<LINK href="../Css.css" rel=stylesheet type=text/css>
</head>
<body>
<table width="500" border="0" align="center" cellpadding="0" cellspacing="2">
<tr>
<td align="center">###title###</td>
</tr>
<tr>
<td align="center">作者：###author###&nbsp;&nbsp;</td>
</tr>
<tr>
<td>###content###
</td>
</tr>
</table>
</body>
</html>

=========================================
再寫(xiě)一個(gè)jsp頁(yè)面: buildhtml.jsp

<%@ page contentType="text/html; charset=gb2312" import="Java.util.*,java.io.*"%>
<%
try{
String title="jsp生成靜態(tài)html文件";
String content="小樣，還搞不定你？";
String editer="webjxcom";
String filePath = "";
filePath = request.getRealPath("/")+"template.htm";
out.print(filePath);
String templateContent="";
FileInputStream fileinputstream = new FileInputStream(filePath);//讀取模塊文件
int lenght = fileinputstream.available();
byte bytes[] = new byte[lenght];
fileinputstream.read(bytes);
fileinputstream.close();
templateContent = new String(bytes);
out.print(templateContent);
templateContent=templateContent.replaceAll("###title###",title);
templateContent=templateContent.replaceAll("###content###",content);
templateContent=templateContent.replaceAll("###author###",editer);//替換掉模塊中相應(yīng)的地方
out.print(templateContent);
// 根據(jù)時(shí)間得文件名
Calendar calendar = Calendar.getInstance();
String fileame = String.valueOf(calendar.getTimeInMillis()) +".html";
fileame = request.getRealPath("/")+fileame;//生成的html文件保存路徑
FileOutputStream fileoutputstream = new FileOutputStream(fileame);//建立文件輸出流
out.print("文件輸出路徑:<br>");
out.print(fileame);
byte tag_bytes[] = templateContent.getBytes();
fileoutputstream.write(tag_bytes);
fileoutputstream.close();
}
catch(Exception e){
out.print(e.toString());
}
%>

－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
mport java.io.*;

import java.net.*;



public class Tools {

??? final static Object lock = new Object();

??? public static void makeHtml(String page, String filePath)...{

??????? makeHtml(page,filePath,"UTF-8");

??? }



??? public static void makeHtml(String page, String filePath,String chartset) {

??????? synchronized (lock) {

??????????? HttpURLConnection huc = null;

??????????? BufferedReader br = null;

??????????? BufferedWriter bw = null;

??????????? try {

??????????????? huc = (HttpURLConnection)new URL(page).openConnection();

??????????????? System.setProperty("sun.net.client.defaultConnectTimeout", "30000");

??????????????? System.setProperty("sun.net.client.defaultReadTimeout", "30000");

??????????????? huc.connect();

??????????????? InputStream stream = huc.getInputStream();

??????????????? bw = new BufferedWriter(new OutputStreamWriter (new FileOutputStream(filePath),chartset));

??????????????? br = new BufferedReader(new InputStreamReader(stream, chartset));

??????????????? String line;

??????????????? while((line = br.readLine())!= null){

?????????????????? if(line.trim().length() > 0){

??????????????????????? bw.write(line);

??????????????????????? bw.newLine();

?????????????????? }

??????????????? }

??????????? }catch (Exception e) {

??????????????? e.printStackTrace();

??????????? }finally {

??????????????? try {

??????????????????? br.close();

??????????????????? bw.close();

??????????????????? huc.disconnect();

??????????????? }catch (Exception e) {

??????????????????? e.printStackTrace();

??????????????? }

??????????? }

??????? }

}

轉(zhuǎn)載于:https://blog.51cto.com/topstar/138331

與50位技術(shù)專家面對(duì)面20年技術(shù)見(jiàn)證，附贈(zèng)技術(shù)全景圖

總結(jié)

以上是生活随笔為你收集整理的利用Java生成静态HMTL页面的方法收集的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。